US11933812B2 - Cross-beam axial accelerometer - Google Patents
Cross-beam axial accelerometer Download PDFInfo
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- US11933812B2 US11933812B2 US18/046,358 US202218046358A US11933812B2 US 11933812 B2 US11933812 B2 US 11933812B2 US 202218046358 A US202218046358 A US 202218046358A US 11933812 B2 US11933812 B2 US 11933812B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/0802—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
- G01P15/0922—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up of the bending or flexing mode type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/097—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by vibratory elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/125—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by capacitive pick-up
Definitions
- One or more example embodiments relate to an accelerometer.
- An accelerometer refers to a sensor that converts a sensed acceleration into an electrical signal and measures.
- a method of sensing an acceleration may be largely classified into a piezoresistive type, a piezoelectric type, a resonant type, an electrostatic capacity type, and the like.
- MEMS micro-electromechanical systems
- the accelerometer that promptly senses only the acceleration in an effective axial direction may be regarded as a high-performance accelerometer.
- the effective axial direction refers to an axial direction of the acceleration to be sensed, and while precisely measuring the acceleration in the effective axial direction, a sensing in a direction other than the axial direction to be measured, that is, in the cross-axis direction should be avoided.
- the accelerometer must be sufficiently able to withstand an external force applied to the sensor due to a sudden acceleration or impact. Therefore, a structure is needed to detect damages in the accelerometer so that it may react quickly to damages in the internal structure. In addition, an accelerometer is needed that may expand a linear range of sensing frequencies by the functioning of a stopper while protrusions or groove structures formed on a cover of the sensor attenuate an impact.
- Japanese Patent Laid-Open Publication No. 4838229 (published on Mar. 12, 2009) describes an accelerometer.
- Example embodiments provide an accelerometer with high sensing precision by forming an elastic beam at an upper side and a lower side of a central body and lowering sensing sensitivity for an acceleration in a cross direction other than an acceleration axis direction to be sensed.
- an accelerometer may quickly identify damages of the elastic beam and detect a malfunction of the sensor by further including diagnostic elements for detecting damages in the elastic beam.
- an accelerometer may buffer, adjust, or block transmission of external physical impacts, heat, or electromagnetic waves by installing an additional functional layer.
- an accelerometer may include a frame portion with an opening formed inside, a central portion disposed in the opening, a connecting portion disposed on an upper surface and a lower surface of the central portion and connecting the frame portion and the central portion, and a sensing portion that converts a sensed acceleration into an electrical signal, and the accelerometer may sense an acceleration in a Z-axis direction penetrating an upper surface and a lower surface of the central portion, and reduce a sensing of an acceleration in an X-axis direction and a Y-axis direction crossing the Z-axis direction.
- the connecting portion may include a first elastic beam extending from an upper surface of the central portion and connected to the frame portion, and a second elastic beam extending from a lower surface of the central portion and connected to the frame portion, and the first elastic beam and the second elastic beam may be disposed in a direction crossing each other.
- the sensing portion may include a sensing element sensing an acceleration, an electrode transmitting an electrical signal of a sensed acceleration, and a wire electrically connecting the sensing element and the electrode, and the sensing element may be disposed on a surface or inside of the first elastic beam or the second elastic beam.
- the sensing element may be configured to be a plurality of sensing elements and each of the sensing elements may be disposed on a same plane or on a different plane.
- the first elastic beam or the second elastic beam may include at least one or more grooves formed on the first elastic beam or the second elastic beam.
- Widths of the first elastic beam and the second elastic beam may be formed to be narrower than a width of one side of the central portion.
- the electrode may be disposed on a surface or inside of the frame portion or the central portion, a lower surface of the frame portion may be attached to external equipment and fixed when the electrode is disposed in the frame portion, and a lower surface of the central portion may be attached to external equipment and fixed when the electrode is disposed in the central portion.
- the sensing element may be formed of a piezoelectric material, a piezoresistive material, or a resonant structure.
- the first elastic beam and the second elastic beam may further include a diagnostic element disposed on a surface of the first elastic beam or the second elastic beam to diagnose damages to each elastic beam.
- the wire may include a trimming resistance disposed on a portion of the wire.
- the sensing portion may include a first cover covering an upper side of the accelerometer, a second cover covering a lower side of the accelerometer, a first electrode installed on an upper surface of the central portion or the frame portion, a second electrode installed on a lower surface of the central portion or the frame portion, a third electrode facing the first electrode and disposed on one surface of the first cover, and a fourth electrode facing the second electrode and disposed on one surface of the second cover, and a method of measuring an acceleration of the sensing portion may be characterized in a method of measuring electrostatic capacity between a plurality of electrodes.
- the accelerometer may include a cover portion disposed on an upper side or a lower side of the accelerometer, and one surface of the frame portion, one surface of the central portion, and one surface of the cover portion facing the frame portion and the central portion may be formed as a plane.
- the accelerometer may further include a cover portion disposed on an upper side or a lower side of the accelerometer, and a bump or a hole may be formed on at least one surface of the frame portion, one surface of the central portion, or one surface of the cover portion facing the frame portion and the central portion.
- the accelerometer may further include a cover portion disposed on an upper side or a lower side of the accelerometer, and at least one receiving element may be formed on one surface of the frame portion or one surface of the central portion, and a bonding agent or an electrode may be received inside the receiving element.
- the cover portion may include a functional layer.
- the accelerometer may increase sensing precision by forming an elastic beam at an upper side and a lower side of a central body and lowering sensing sensitivity for an acceleration in a cross direction other than an acceleration axis direction to be sensed.
- the accelerometer may quickly identify damages of the elastic beam and detect a malfunction of the sensor by further including diagnostic elements for detecting damages in the elastic beam.
- the accelerometer may buffer, adjust, or block transmission of external physical impacts, heat, or electromagnetic waves by installing an additional functional layer.
- FIG. 1 A is a perspective view illustrating an accelerometer according to an example embodiment
- FIG. 1 B is a diagram illustrating a shape in which an electrode of an accelerometer is disposed on an upper surface of a central portion according to an example embodiment
- FIG. 2 is a diagram illustrating a shape of an accelerometer viewed from an upper side according to an example embodiment
- FIGS. 3 A and 3 B are cross-sectional side views illustrating an accelerometer according to an example embodiment
- FIGS. 4 A to 4 C are diagrams illustrating a position of a sensing element 410 that may be disposed on an elastic beam in an accelerometer according to an example embodiment
- FIG. 5 A is a diagram illustrating a shape of an elastic beam having a groove formed in a portion in an accelerometer according to an example embodiment
- FIG. 5 B is a diagram illustrating an accelerometer including an elastic beam having no grooves according to an example embodiment
- FIG. 5 C is a diagram illustrating an accelerometer including an elastic beam having a groove according to an example embodiment
- FIGS. 5 D and 5 E are diagrams illustrating a shape in which a sensing element is a resonant structure in an accelerometer according to an example embodiment
- FIG. 6 is a diagram illustrating a shape in which widths of a first elastic beam and a second elastic beam are formed to be narrower than a width of one side of a central portion in an accelerometer according to an example embodiment
- FIGS. 7 A and 7 B are diagrams illustrating an accelerometer that senses an acceleration using a method of measuring electrostatic capacity according to an example embodiment
- FIG. 8 is a diagram illustrating a shape in which a diagnostic element is disposed on a surface of a first elastic beam in an accelerometer according to an example embodiment
- FIG. 9 is a diagram illustrating a shape in which a trimming resistance is included in a wire in an accelerometer according to an example embodiment
- FIG. 10 is a diagram illustrating an accelerometer in which a cover portion is formed according to an example embodiment
- FIGS. 11 A, 11 B, and 11 C are diagrams illustrating a shape of a cover portion formed in a form in which one surface is not a plane;
- FIGS. 12 A and 12 B are diagrams illustrating a shape of a cover portion having a receiving element formed on one surface in an accelerometer according to an example embodiment.
- FIG. 13 is a diagram illustrating a shape in which a functional layer is further included in a cover portion in an accelerometer according to an example embodiment.
- FIG. 1 A is a perspective view illustrating an accelerometer according to an example embodiment.
- the accelerometer may include a frame portion 100 with an opening formed in a center, a central portion 200 disposed in an opening inside the frame portion, a connecting portion 300 connecting the central portion and the frame portion, and a sensing portion 400 sensing an acceleration and converting the sensed acceleration into an electrical signal.
- the connecting portion 300 may include a first elastic beam 300 a extending from an upper surface of the central portion 200 and connected to the frame portion 100 , and a second elastic beam 300 b extending from a lower surface of the central portion and connected to the frame portion.
- the first elastic beam 300 a and the second elastic beam 300 b including the connecting portion 300 are elastic members formed in a shape of a beam, and a deformation such as extension and contraction may occur according to a relative movement of the central portion 200 and the frame portion 100 .
- the sensing portion 400 may be disposed on a portion of the frame portion 100 , the central portion 200 , or the connecting portion 300 .
- the sensing portion 400 may include a sensing element 410 sensing an acceleration, an electrode 430 transmitting an electrical signal of the sensed acceleration, and a wire 420 electrically connecting the sensing element and the electrode.
- the central portion 200 may function as a mass.
- a deformation may occur in each elastic beam connected to the central body due to the inertia of the central body.
- the sensing element 410 disposed on each elastic beam may sense a deformation
- the wire 420 connected to the sensing element and the electrode 430 connected to the wire may convert the sensed acceleration into an electrical signal.
- the electrode 430 may be disposed on the frame portion.
- FIG. 1 B a shape in which the electrode 430 of the accelerometer is disposed on an upper surface of the central portion 200 according to an example embodiment is illustrated.
- the electrode 430 of the sensing portion may be disposed on an upper surface of the central portion 200 in addition to the frame portion 100 . That is, since the sensing element 410 serves to detect a deformation of the elastic beam, the sensing element 410 should be positioned on the elastic beam, but the position of the electrode 430 that converts an acceleration sensed by the sensing element into an electrical signal may have no limitation.
- the sensing element 410 may be a piezoresistive, a piezoelectric, or a resonant structure, and may sense an acceleration using a method of measuring electrostatic capacity as will be described later.
- the electrical characteristics of materials may be used for the accelerometer, and in the case of the resonant structure sensing element, a change in resonant frequencies of the resonant structure according to a change in an acceleration may be used for the accelerometer.
- the types of sensing elements are not necessarily limited thereto.
- the accelerometer may have one surface attached to an object to sense an acceleration of a certain object.
- the accelerometer attached to the object also moves as the object moves, and thus the acceleration of the object may be measured.
- the accelerometer measures the acceleration through a relative movement of the central portion 200 and the frame portion 100 due to the inertia, so the acceleration may not be measured when both the central portion and the frame portion are firmly attached to the object.
- the deformation may not occur in the first elastic beam 300 a and the second elastic beam 300 b including the connecting portion, and thus the sensing element may not sense the acceleration.
- the central portion 200 may be attached to the object.
- the central portion 200 may be connected to the first elastic beam 300 a and the second elastic beam 300 b and be placed in a movable state.
- the electrode 430 among components including the sensing portion as illustrated in FIG. 1 A may be disposed on the frame portion 100 and fixed to the object with the frame portion. That is, unlike the sensing element 410 that needs to detect the deformation due to the movement of the elastic beam, the electrode doesn't need to move, so it may be fixed with the frame portion.
- the frame portion 100 may be placed in a relatively movable state with respect to the central portion as illustrated in FIG. 1 B .
- the electrode may be disposed at the central portion.
- a direction of the acceleration to be sensed by the accelerometer is a Z-axis direction
- the Z-axis direction may refer to an axial direction penetrating an upper surface and a lower surface of the central portion 200 vertically.
- the axial direction other than this may be defined as a cross-axis direction (e.g., an X-axis direction and a Y-axis direction crossing vertically to the Z-axis direction).
- FIG. 2 is a diagram illustrating a shape of an accelerometer viewed from an upper side according to an example embodiment.
- the first elastic beam 300 a and the second elastic beam 300 b may be disposed in a direction crossing each other when viewed from an upper side of the accelerometer. Referring to FIG. 2 , the first elastic beam 300 a and the second elastic beam 300 b touching an upper surface and a lower surface of the central portion 200 , respectively, may be formed to cross each other vertically.
- FIGS. 3 A and 3 B are cross-sectional side views illustrating an accelerometer according to an example embodiment.
- the first elastic beam 300 a when viewed from the X-axis or the Y-axis direction, respectively, the first elastic beam 300 a may extend from an upper surface of the central portion 200 and be connected to the frame portion 100 , and the second elastic beam 300 b may extend from a lower surface of the central portion 200 and be connected to the frame portion 100 .
- FIGS. 4 A to 4 C are diagrams illustrating a position of a sensing element 410 that may be disposed on an elastic beam in an accelerometer according to an example embodiment.
- a plurality of sensing elements may be formed, and the plurality of sensing elements may be respectively disposed on a same plane or a different plane.
- FIG. 4 A a shape in which a plurality of sensing elements 410 is disposed on an upper surface of the first elastic beam 300 a is illustrated.
- the sensing element is not necessarily disposed on an upper surface of the elastic beam and may be disposed simultaneously on a lower surface and an upper surface of the elastic beam.
- the sensing element may be formed on a surface of the elastic beam and inside the elastic beam.
- the sensing element formed in plurality may be disposed on a same plane or a different plane on the elastic beam as described above, but an arrangement structure of the sensing element is not limited to the form illustrated in FIGS. 4 A to 4 C , and the sensing element may be disposed on a surface or inside the second elastic beam in addition to the first elastic beam.
- FIG. 5 A is a diagram illustrating a shape of an elastic beam having a groove formed in a portion in an accelerometer according to an example embodiment.
- the first elastic beam 300 a and the second elastic beam 300 b may include a groove 310 formed at a portion of both ends thereof.
- the elastic beam having a groove decreases elastic modulus. Therefore, the elastic beam may react promptly to a smaller acceleration, and accordingly, the sensitivity of accelerometer may be increased.
- FIG. 5 B is a diagram illustrating an accelerometer including an elastic beam having no grooves according to an example embodiment.
- FIG. 5 C is a diagram illustrating an accelerometer including an elastic beam having a groove according to an example embodiment.
- the sensing element 410 may be disposed in the remaining area between the grooves.
- the deformation width of the elastic beam of the sensor attachment portion may become larger than that of the accelerometer (see FIG. 5 B ) having a general elastic beam. That is, even when the same sensor is used, the effect of amplifying an output value may be obtained.
- FIGS. 5 D and 5 E are diagrams illustrating a shape in which a sensing element 410 is a resonant structure in an accelerometer according to an example embodiment.
- a sensing element 410 is a resonant structure in an accelerometer according to an example embodiment.
- FIG. 6 is a diagram illustrating a shape in which widths of the first elastic beam and the second elastic beam are formed to be narrower than a width of one side of the central portion in an accelerometer according to an example embodiment.
- widths of the first elastic beam 300 a and the second elastic beam 300 b disposed on an upper surface and a lower surface of the central portion 200 may be formed to be narrower than a width of one side of the central portion.
- the elastic modulus of each elastic beam may become smaller than when the width of each elastic beam is formed to be the same as the width of one side of the central portion. Accordingly, even when the same acceleration is applied, the width of the movement of the center portion becomes larger, and thus, the effect of increasing the sensing sensitivity may be obtained.
- FIGS. 7 A and 7 B are diagrams illustrating an accelerometer that senses an acceleration using a method of measuring electrostatic capacity according to an example embodiment.
- FIG. 7 A may represent a shape such that a first electrode 431 and a second electrode 432 are installed on an upper surface and a lower surface of the central portion, respectively, and a third electrode 433 corresponding to the first electrode and a fourth electrode 433 corresponding to the second electrode are installed on a first cover 550 a and a second cover 550 b , respectively.
- FIG. 7 B may represent a shape such that the first electrode 431 and the second electrode 432 are installed in the frame portion, and the third electrode 433 corresponding to the first electrode and the fourth electrode 434 corresponding to the second electrode are installed in the first cover 550 a and the second cover 550 b , respectively.
- the accelerometer may further include the first cover 550 a that covers an upper surface of the frame portion 100 , the central portion 200 , and the connecting portion 300 , and the second cover 550 b that covers a lower surface thereof.
- first cover 550 a and the second cover 550 b are used as an attaching portion of an electrode, it is possible to provide an accelerometer that measures electrostatic capacity.
- the accelerometer using a method of measuring electrostatic capacity may sense an acceleration by configuring a capacitor using the first electrode 431 and the second electrode 432 installed on one surface of the central portion or the frame portion, and corresponding to thereof, the third electrode 433 and the fourth electrode 434 , which face the first electrode and the second electrode and are disposed on one surface of the first cover 550 a and the second cover 550 b , respectively.
- a movement may occur in the third electrode 433 facing the first electrode 431 as the central portion 200 and the frame portion 100 relatively move. Accordingly, a distance between the electrodes may be changed, and as the distance between the electrodes is changed, the electrostatic capacity of the capacitor may increase or decrease. The increase/decrease in the electrostatic capacity may also occur between the second electrode 432 and the fourth electrode 434 . In this way, the acceleration may be sensed using a method of measuring the increase/decrease of the electrostatic capacity.
- FIG. 8 is a diagram illustrating a shape in which a diagnostic element 450 is disposed on a surface of a first elastic beam 300 a in an accelerometer according to an example embodiment.
- each elastic beam may correspond to a key component that is deformed in response to an acceleration.
- an error may occur in sensing the acceleration or the precision may be greatly reduced. Therefore, it is possible to identify and react to the damages of the elastic beam early through the diagnostic element 450 .
- the diagnostic element 450 formed to diagnose damages may be disposed on a surface of the first elastic beam 300 a , but an arrangement of the diagnostic element is not necessarily limited to on the first elastic beam and may also be disposed on the second elastic beam 300 b.
- FIG. 9 is a diagram illustrating a shape in which a trimming resistance 421 is included in a wire 420 in an accelerometer according to an example embodiment.
- the sensing sensitivity may be controlled according to a situation by changing the size of the overall resistance as needed.
- FIG. 10 is a diagram illustrating an accelerometer in which a cover portion 500 is formed according to an example embodiment.
- the accelerometer according to an example embodiment may be formed to further include the cover portion 500 , and the cover portion 500 may protect the accelerometer from external foreign materials and impacts and be utilized as an attachment site for an electrode and a bonding agent.
- the cover portion 500 may cover both an upper surface and a lower surface of the accelerometer.
- the present disclosure is not necessarily limited thereto, and the cover portion may cover only one surface (e.g., an upper surface) of the accelerometer.
- one surface of the cover portion may be formed in a plane as illustrated in FIG. 10 , but is not necessarily limited to a plane and may be in a state in which a bump or a hole is formed.
- FIGS. 11 A, 11 B, and 11 C are diagrams illustrating a shape of a cover portion 500 formed in a form in which one surface is not a plane.
- a bump may be formed on one surface of the cover portion 500 .
- the bump may be a step 501 a .
- the bump may be at least one or more protrusions 501 b .
- at least one or more holes 501 c may already be formed in the cover portion 500 .
- the bump or the hole may not necessarily be formed only on the cover portion 500 , and may be formed on one surface of the frame portion or the central portion corresponding to the cover portion.
- FIGS. 12 A and 12 B are diagrams illustrating a shape of a cover portion having receiving elements 502 a and 502 b formed on one surface in an accelerometer according to an example embodiment.
- An electrode of the sensing portion may be disposed on the receiving element or a bonding agent for attaching the cover portion may be filled inside the receiving element.
- the receiving element may be formed on the cover portion 500 as in FIGS. 12 A and 12 B , and may also be formed on one surface of the frame portion or the central portion touching the cover portion.
- FIGS. 12 A and 12 B only illustrates the cover portion 500 as an example of a configuration in which a receiving element is formed.
- the receiving element 502 a may be formed at both ends of the cover portion.
- the receiving element 502 b may be formed in the central portion of the cover portion.
- FIG. 13 is a diagram illustrating a shape in which a functional layer 510 is further included in a cover portion 500 in an accelerometer according to an example embodiment.
- the functional layer 510 may be formed to buffer, adjust, or block transmission of external physical impacts, heat, or electromagnetic waves, and may be additionally disposed on the cover portion 500 .
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Abstract
Description
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KR1020210136658A KR102505956B1 (en) | 2021-10-14 | 2021-10-14 | Accelerometer |
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US11933812B2 true US11933812B2 (en) | 2024-03-19 |
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Citations (23)
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US5343731A (en) * | 1991-10-02 | 1994-09-06 | Nec Corporation | Semiconductor accelerometer |
US5460044A (en) * | 1992-12-25 | 1995-10-24 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor acceleration detecting apparatus |
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